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Don't evaluate built-in system functions if they are overridden.

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We don't support evaluating user-defined system functions at compile
time. If possible, defer evaluation until run time. If used in a
constant expression, output a "sorry" message.
This commit is contained in:
Martin Whitaker
2019-10-19 16:12:17 +01:00
parent bf655003e8
commit 1069a0ef02
9 changed files with 72 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files
sys_funcs.cc
+32 -10
View File
@@ -30,14 +30,14 @@
*/
static const struct sfunc_return_type sfunc_table[] = {
{ "$realtime", IVL_VT_REAL, 1, 0 },
{ "$bitstoreal", IVL_VT_REAL, 1, 0 },
{ "$itor", IVL_VT_REAL, 1, 0 },
{ "$realtobits", IVL_VT_LOGIC, 64, 0 },
{ "$time", IVL_VT_LOGIC, 64, 0 },
{ "$stime", IVL_VT_LOGIC, 32, 0 },
{ "$simtime", IVL_VT_LOGIC, 64, 0 },
{ 0, IVL_VT_LOGIC, 32, 0 }
{ "$realtime", IVL_VT_REAL, 1, false, false },
{ "$bitstoreal", IVL_VT_REAL, 1, false, false },
{ "$itor", IVL_VT_REAL, 1, false, false },
{ "$realtobits", IVL_VT_LOGIC, 64, false, false },
{ "$time", IVL_VT_LOGIC, 64, false, false },
{ "$stime", IVL_VT_LOGIC, 32, false, false },
{ "$simtime", IVL_VT_LOGIC, 64, false, false },
{ 0, IVL_VT_LOGIC, 32, false, false }
};
struct sfunc_return_type_cell : sfunc_return_type {
@@ -69,9 +69,8 @@ void cleanup_sys_func_table()
}
}
const struct sfunc_return_type* lookup_sys_func(const char*name)
static struct sfunc_return_type* find_in_sys_func_list(const char*name)
{
/* First, try to find the name in the function list. */
struct sfunc_return_type_cell*cur = sfunc_list_head;
while (cur) {
if (strcmp(cur->name, name) == 0)
@@ -80,6 +79,16 @@ const struct sfunc_return_type* lookup_sys_func(const char*name)
cur = cur->next;
}
return 0;
}
const struct sfunc_return_type* lookup_sys_func(const char*name)
{
/* First, try to find the name in the function list. */
struct sfunc_return_type*def = find_in_sys_func_list(name);
if (def)
return def;
/* Next, look in the core table. */
unsigned idx = 0;
while (sfunc_table[idx].name) {
@@ -147,12 +156,21 @@ int load_sys_func_table(const char*path)
cp = stype + strcspn(stype, " \t\r\n");
if (cp[0]) *cp++ = 0;
struct sfunc_return_type*def = find_in_sys_func_list(name);
if (def) {
/* Keep the original definition, but flag that it
overrides a later definition. */
def->override_flag = true;
continue;
}
if (strcmp(stype,"vpiSysFuncReal") == 0) {
cell = new struct sfunc_return_type_cell;
cell->name = lex_strings.add(name);
cell->type = IVL_VT_REAL;
cell->wid = 1;
cell->signed_flag = true;
cell->override_flag = false;
append_to_list(cell);
continue;
}
@@ -163,6 +181,7 @@ int load_sys_func_table(const char*path)
cell->type = IVL_VT_LOGIC;
cell->wid = 32;
cell->signed_flag = true;
cell->override_flag = false;
append_to_list(cell);
continue;
}
@@ -203,6 +222,7 @@ int load_sys_func_table(const char*path)
cell->type = IVL_VT_LOGIC;
cell->wid = width;
cell->signed_flag = signed_flag;
cell->override_flag = false;
append_to_list(cell);
continue;
}
@@ -213,6 +233,7 @@ int load_sys_func_table(const char*path)
cell->type = IVL_VT_VOID;
cell->wid = 0;
cell->signed_flag = false;
cell->override_flag = false;
append_to_list(cell);
continue;
}
@@ -223,6 +244,7 @@ int load_sys_func_table(const char*path)
cell->type = IVL_VT_STRING;
cell->wid = 0; // string is a dynamic length type
cell->signed_flag = false;
cell->override_flag = false;
append_to_list(cell);
continue;
}